You will find a particular breed of people who only ever buy your specials. They float from site to site looking for bargains for stuff they can resell on. This area is where you put your hard to shift stock. Reduce the price, set an expiry date if you wish or if your busy and watch as the bargain hunters snap them up.
We have all purchased non-performing products that we get stuck with and need to sell them off quick. The Special Products feature allows you to do this but you can also discount it and set a date in the future when it is no longer a special product.